Device for increasing small pressure differences



Oct. 27, 1925.

G. WUNSCH DEVICE FOR INCREASING SMALL PRESSURE DIFFERENCES OriginalFiled Feb. 1924 Patented a. 27; 1925.

euino wifivscn. hr 'STEGLITZ, NEAR FFICE...

BERLIN, GERMANY, Assmnon 'ro-"AsxANm- WERKE' A.-G. VORMALSCENTRALWERKSTATT-DESSAU UND CARL IB'AMBERG' rnmnmnu, or MANY.

FEIEDENALU, NEAR BERLIN, GERMANY, A CORPORATIDN OF GER- r DEVICE For.INCREASING SMALL rnnssunr: nrrrnannons- Original aj ncatio iwn aixebruar29, 1924, Serial No. 696,103. DivideiI-and this application filedFebruary 20, 1925. Serial No. 10,715.

To all whom. it may concern Be it known thatl; Gmno WfiNsoH, a.

citizen of the German Empire; residing at 2 Stindestrasse,- Steglitz,near Berlin, Gen 6 many, have invented certain new and usefulImprovements in or Relating to a Device for Increasing Small PressureDiffer ences, of which the following is a specification.

My application for Letters Patent Serial No. 696,103 of which thepresent application is a divisional one relates to a process and meansfor the frictionless transmission of movement from a moving primaryelement to a secondary'element to be moved, which can be utilized invarious branches of industry. According to the said invention a veryslight movement is transmitted from a primary element, for instance suchasis-usually automatically effected on the said element by aninstrument, to a secondary controlling or setting element or to aservomotor, whereupon the said secondary element or servomotor effectsthe required operationf The present invention relates to a practicalapplication of the devices claimed in the said copending application andshows how 1 the said process-and means may be used in pressuredifferences. I

The accompanying drawing illustrates diagrammatically a device forincreasing small pressure differences according to the invention.

In the drawing 37 is a vessel to which are supplied by means of twopipes 38 and 39 the two pressures,l the difi'erence between which is tobe measured or utilized for producing a movement. The pressurewhich issupplied through the twopipes spreads in' the two chambers 40 and 41into which' the vessel 37 is divided by a diaphragm 42. The

onds to the pipe a or [the compressed air or compressed gas is ountedopposite an inlet opening 47 which connection with devices forincreasing small" diaphragm 42 is connected by a rod 43 to a.

my copending appli --compressed gas or a liquid underpressure. flowsthrough it; The outlet nozzle 46 for.

leads to a cylinder 48. In the latter is adapted to move a piston 49which may be pivoted to one end of a two-armed, lever 5 50 or engagewith the; same by means of a knife edge. The two-armed lever 50oscillates about a knife edge 51, and its other end is connected by arod 52 tothe pipe 44. From the cylinder 48 a pipe 53 leads to that pointwhere the pressure difference is to be utilized, and to the pipe 53could also be connected a pipe 54 lead'ing'to a pressure gauge or thelike.

The working of the device described is as follows:

As long as the pressurespassing through the pipes 38 and 39 into thechambers 40 and 41 remain equal to each other, the dia-.

phragm will remain at rest. I If the pressure changes, for instance ifthe pressure in the pipe 38 increases, the pressure in the chamber 41will also increase. The diaphragm 42 will then be moved to the left inthe figure and in that Way. will move the pipe 44 further to the left.Assuming, that the pipe 44 was in such a position that the nozzle 46 wasonly partially in front of the inlet opening 47 the movementofth'e pipe44 will bring the nozzle 46 further in 'front of the opening 47. Moreliquid under pressure will therefore pass into the cylinder48, thepressure in the latter'will therefore become higher and the piston49'will be moved.

The latter will then turn the lever 50 about the'knife edge 51, owing towhich the pipe 44 will be turned back again.- In the end, astate ofequilibrum will be reached in which the pressure in the cylinder 48.will be at a certain ratio to the excess of pres- 9 sure in the chamber41 over the pressure in the chamber 40.- By suitable. choosing thepressure of the compressed air "admitted through the pipe 44, acomparatively high pressure can be produced in the cylinder 48 9 owmg tothe smallness of the diameter of the piston49 relatively to the diameterof 7 I wish it to be understood that I have shown and described merelyone example of the invention in connection with a certain system of adevice for increasing small pressure diiferences. .However it will beevident to those skilled in the art that it may be used also inconnection with other kinds of such plantswithout departing from thespirit of'the invention. J

Having now particularly described and ascertained the nature of my saidinvention and in what manner the same is to'be performed, I declare:that what I claim is:

- ,saidpipe and producing a return movement to the, pressure differenceof the said pipe'opposed to its forward movement by said means, so thatthe pressure in the cylinder becomes proportional and means formeasuring or utilizing the pressure within said cylinder.

2. In a device for increasing small pressure differences for the purposeof measuring further means having a fixed inlet opening opposite to thefree movable opening of or utilizing them in combination a pipe throughwhich flows a pressure medium, means adapted to transmit the pressurevariation to said pipe and thereby move it,

said. pipe, the pressure within said means being varied according to thesaid movable opening being more or less opposite to said inlet openingand producing a return movement of the said pipe opposed to its forwardmovement by said first mentioned means, and means for measuring orutilizing the pressure within said further means.

3. In a device for increasing small pressure difi'erences for thepurpose of measuring or utilizing them in combination a pipe throughwhich flows a pressure medium a diaphragm adapted to transmit thepressure variations to said pipe and thereby move it, a cylinder havingfixed inlet opening opposite to the free movable opening of'said pipe, apiston within said cylinder connected with said pipe and producing areturn movement of the said pipe opposed to its forwardmovement by saiddiaphragm, so that the pressure in the cylinder becomes proportional tothe pressure difference and means for measuring or utilizing the pres:sure within said cylinder.

4. In a device for increasing small pressure differences for the purposeof measuring'or utilizing them in combination a pipe through which flowsa pressure medium,

means adapted to transmit the pressure variations to said pipe andthereby move it,

a cvlinder having fixed inlet opening opposite to the free movableopening of said pipe, a piston within said cylinder, a lever havingadjustable lever arms connecting said piston with said pipe andproducing a return movement ofthe said pipeopposed to its forwardmovement by said means, so that the pressure in the cylinder becomesproportional to the pressure difference and means for measuring orutilizing the pressure within said cylinden' In testimony whereof I haveaflixed my signature.

GUIDO WUNSOH.

